MAX86174B
PRE-RELEASEBest-in-Class Optical Pulse Oximeter and Heart-Rate Sensor AFE for Wearable Health
Industry's Smallest PPG AFE for Space Constrained Wearables
Overview
- Complete Optical Data Acquisition System
- Ultra-Low-Power Operation for Body Wearable Devices
- Low-Power-Operation, Optical Readout Channel < 11µA (typ) at 25fps
- Exposure Integration Period Ranging from 14.6µs to 117.1µs
- Low Shutdown Current < 1µA (typ)
- Excellent Top-End Dynamic Range > 93dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)
- Extended Dynamic Range up to 111dB (Averaging and Off-Chip Filtering) to Enable SpO2 on Wrist/Chest for Low Perfusion Cases
- Support Frame Rates from 1fps to 2048fps
- High-Resolution 20-Bit Charge-Integrating ADCs
- Support Both Burst Averaging and Decimation Averaging Modes
- On-Chip 12Hz Low-Pass Filter for Improved SNR and Reduced Power for Continuous Heart-Rate Measurement
- Supports Two PD Inputs for Multi-Parameter Measurements
- Supports Four LED Driver Output Pins Generated from Two 8-Bit LED Current Drivers
- Low Dark-Current Noise of < 50pARMS (Sample-to-Sample Variance in 117.1µs Integration Time)
- Excellent Ambient Range and Rejection Capability
- 200µA Ambient Photodiode Current
- > 70dB Ambient Rejection at 120Hz (Burst Average > 2)
- Miniature 1.67mm x 1.78mm, 0.4mm Ball Pitch, 4 x 4 WLP Package
- -40°C to +85°C Operating Temperature Range
The MAX86174A/MAX86174B are ultra-low-power optical data acquisition systems with both transmit and receive channels. On the transmitter side, the MAX86174A/MAX86174B have four LED driver output pins. Each pin is programmable from two, high-current, 8-bit LED drivers. On the receiver side, the MAX86174A consists of two optical readout channels that can operate simultaneously while the MAX86174B has a single optical readout channel. The devices have low-noise, charge-integrating analog front-end, 20-bit ADC, and best-in-class ambient-light cancellation (ALC) circuits.
Due to the low power consumption, compact size, ease and flexibility of use, the MAX86174A/MAX86174B are ideal for a wide variety of optical sensing applications such as pulse oximetry and heart-rate detection.
The MAX86174A/MAX86174B operate on a 1.8V main supply voltage and a 2.7V to 5.5V LED driver supply voltage. The devices support both I2C- and SPI-compatible interfaces in a fully autonomous way. The devices have a large 256-word built-in FIFO. The MAX86174A/MAX86174B are available in a compact 16-WLP package.
Applications
- Body Hydration
- Clinical Accuracy
- Heart-Rate Variability
- Maximum Oxygen Consumption (VO2 max)
- Muscle and Tissue Oxygen Saturation (SmO2 and StO2)
- Optical Heart Rate
- Optimized Performance to Detect
- Oxygen Saturation (SpO2)
- Suitable for Wrist, Finger, Ear, and Other Locations
- Wearable Devices for Fitness, Wellness and Medical Applications
Documentation
Data Sheet 1
User Guide 1
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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).
Request an NDAThis is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Analog to Digital Converters (ADCs) 2 | ||
| MAX86170B | PRODUCTION | Low-Noise AFE for Pulse Oximeter and Heart Rate Monitor |
| MAX86171 | PRODUCTION | Low-Noise AFE for Pulse Oximeter and Heart Rate Monitor |
| Product 1 | ||
| MAX86170A | RECOMMENDED FOR NEW DESIGNS | Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor AFE for Wearable Health |
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